As the heir of a grand Patek Philippe classic, the Ref. 5270 Chronograph with a perpetual calendar is now available in yellow gold for the first time – an elegant outfit for this timeless watch with a concave bezel and fluted lugs. The silvery opaline dial is superbly legible. The caliber CH 29-535 PS Q movement combines traditional design with six patented innovations and an extremely slender calendar mechanism.

Watch
Manually wound mechanical movement. 
Caliber : CH 29-535 PS Q.
Central chronograph hand. 
Instantaneous 30-minute counter. 
Perpetual Calendar. 
Day, month, leap year and day/night display in apertures. 
Date by hand. 
Moon phases. 
Seconds subdial.
Dial : Silvery opaline, gold applied hour markers. 
Tachymeter scale.
Case : Yellow gold. 
Diameter: 41 mm. 
Height: 12.4 mm. 
Water resistant : 30 m. 
Sapphire crystal case back.
Strap : Alligator leather with square scales, hand-stitched, matte chocolate brown. Fold-over clasp.
Diameter: 32 mm. 
Thickness: 7 mm. 
Number of parts: 456. 
Jewels: 33. 
Power reserve with the chronograph disengaged: min. 55 hours - max. 65 hours. 
Balance: Gyromax®. 
Frequency: 28,800 semi-oscillations/hour (4 Hz). 
Balance spring: Breguet. 
Hallmark: Patek Philippe Seal.